Supplemental information - Schedule of Redeemable Noncontrolling Interest (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	May 31, 2025	May 31, 2024	May 31, 2025	May 31, 2024
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance	$ 104	$ 172	$ 174	$ 167
Acquisition of non-controlling interests	0	0	(33)	0
Net income (loss) attributable to redeemable non-controlling interests	5	(1)	2	1
Redemption price adjustments and other	0	1	(34)	5
Ending balance	$ 110	$ 173	$ 110	$ 173